Quarterly report pursuant to Section 13 or 15(d)

Property, plant and equipment (Details)

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Property, plant and equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property, plant and equipment    
Total property, plant and equipment $ 78,714 $ 71,988
Less accumulated depreciation (37,641) (34,442)
Net property, plant and equipment 41,073 37,546
Land    
Property, plant and equipment    
Total property, plant and equipment 1,500 1,500
Land improvements    
Property, plant and equipment    
Total property, plant and equipment 2,999 2,292
Leasehold Improvements    
Property, plant and equipment    
Total property, plant and equipment 643 499
Buildings    
Property, plant and equipment    
Total property, plant and equipment 22,862 21,918
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 33,931 31,780
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 10,577 10,070
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 2,253 1,999
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 3,949 $ 1,930